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She also shared a number of photos of Stella and her seven-year-old sister Hattie at the convention, held at The District at Tustin Legacy.

Slime convention: Spelling was wearing a fuchsia sweater and a grey knit winter hat, with a light pink Stylish Slime by Stella apron

'So proud of my #girlbosses,' Spelling said on Instagram on Sunday. 'Today, Stella at 10 years old is one of the youngest slimers on the scene and continues to rock her booming slime biz @stylishslimebystella at another Slime Convention.'

'I'm so proud watching her do it all from creating the DIY slime to handling all the business transactions herself,' the proud mother added.

'She's so inspiring,' Spelling added. 'She even the support of her younger sister Hattie today. Leading by example and Slaying Sunday.'

Girl boss: 'So proud of my #girlbosses,' Spelling said on Instagram on Sunday. 'Today, Stella at 10 years old is one of the youngest slimers on the scene and continues to rock her booming slime biz @stylishslimebystella at another Slime Convention'

Proud mom: 'I'm so proud watching her do it all from creating the DIY slime to handling all the business transactions herself,' the proud mother added

Stella's display included several containers of slime, along with a spinning wheel with a number of different options written on the wheel.

She also had a sign that revealed a number of her different products, including, Starburst Milkshake, Santa's Soda Pop, Cotton Candy Gumdrop and Gingerbread Cookie Dough.

Spelling also took to her Instagram story to share more from the event, including a brief video of Stella judging the 'crunchy slime competition.'

Young entrepreneur: Stella's display included several containers of slime, along with a spinning wheel with a number of different options written on the wheel

New products: She also had a sign that revealed a number of her different products, including, Starburst Milkshake, Santa's Soda Pop, Cotton Candy Gumdrop and Gingerbread Cookie Dough

Stella and Hattie are two of the five children Spelling has with her husband, actor Dean McDermott, who she's been married to since 2006.

Their oldest child is Liam, 11, along with six year old Finn and three year old Beau.

Spelling most recently starred in Syfy's final Sharknado movie, The Last Sharknado: It's About Time.

Spelling kids: Stella and Hattie are two of the five children Spelling has with her husband, actor Dean McDermott, who she's been married to since 2006

Slime time: Their oldest child is Liam, 11, along with six year old Finn and three year old Beau